The spindles part #s are, left: 201219–202 and right: 201218–202, but I was unable to find any place that actually sold them. I have the exact same go kart and was looking for a left spindle. If you find a source for the spindles, let me know please
(for everyone elses reference, heres a picture showing the spindles:
)
I replaced the front bearings, which are part # 499502HNR, the ones with the snap ring. (5/8"X1-3/8"X11MM) you can get them for < $3 each on ebay shipped. You can find them at tractor supply also, but I found that they were cheaper on ebay.